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Forum: Main CFD Forum

August 1, 2013, 10:05

Replies: 34

Dynamic Smagorinsky model- Filtering Concept

Views: 6,178

Posted By sbaffini

Well, i am referring to the use of an...

Well,

i am referring to the use of an "enhanced" velocity field in S and S_ij. More specifically, there is a huge amount of literature referring to the so called Multilevel LES approach where,...

Forum: Main CFD Forum

August 1, 2013, 07:54

Replies: 34

Dynamic Smagorinsky model- Filtering Concept

Views: 6,178

Posted By sbaffini

Dear CFDJosh, i genuinely don't understand...

Dear CFDJosh,

i genuinely don't understand some of your points. More specifically:

- you started by "you want a filter with a monotonically decreasing transfer function with F(k_max) = 0" (i...

Forum: Main CFD Forum

July 31, 2013, 03:18

Replies: 34

Dynamic Smagorinsky model- Filtering Concept

Views: 6,178

Posted By sbaffini

Dear Mahfuz, i'm trying to understand your...

Dear Mahfuz,

i'm trying to understand your question but i might have some difficulty, so let me give you this first shot. In LES you have:

- basic "grid" filter: it is always present and is...

Forum: Main CFD Forum

July 30, 2013, 07:14

Replies: 34

Dynamic Smagorinsky model- Filtering Concept

Views: 6,178

Posted By sbaffini

If i can add my two cents, recalling what i wrote...

If i can add my two cents, recalling what i wrote some posts above, the basic idea of the test filter is to provide a "test" velocity field to extract some information useful for the calibration of...

Forum: Main CFD Forum

April 2, 2012, 11:46

Replies: 34

Dynamic Smagorinsky model- Filtering Concept

Views: 6,178

Posted By sbaffini

I was too lazy in the previous post to specify...

I was too lazy in the previous post to specify that:

\tilde{\bar{S}}_{ij} = \frac{1}{2} \left( \frac{\partial \tilde{\bar{u}}_i}{\partial x_j} + \frac{\partial \tilde{\bar{u}}_j}{\partial x_i}...

Forum: Main CFD Forum

April 2, 2012, 03:47

Replies: 34

Dynamic Smagorinsky model- Filtering Concept

Views: 6,178

Posted By sbaffini

Dear saeedi, the question is very simple....

Dear saeedi,

the question is very simple. When you have a test filtered vector \tilde{\bar{u}}_i or tensor \tilde{\bar{S}}_{ij} ,
you actually apply the filter on their single components...

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